Method of making boiler drums



June 25, 1929.

HARTER METHOD OF MAKING BOILER DRUMS Filed Sept. 9, 1926 INVENTOR BY /f/M ATTORNEY8 Patented June 25, 1929.

UNITED STATES 1,718,233 PATENT OFFICE.

ISAAC HARTER, OF DONGAN HILLS, YORK, ASSIGNOR TO THE BAIBCOCK & WILGOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF -NEW JERSEY.

METHOD OF MAKING BOILER DRUMS.

Application filed September This invention relates to seamless drums for high pressure boilers and the like, provided with manhole covers adapted to stand high pressures, and methods of making such drums.

An embodiment of the invention is illustrated in the accompanying drawings in which Fig. 1 is an elevation of a drum partly in section, and Fig. 2 is an exterior view of oneend of the same.

Like reference characters indicate lik parts in the drawings.

In the form illustrated, the drum or high pressure container 5 is made from a seamless cylindrical shell 6, the ends being closed in, in any suitable manner, to form a kind of neck on each end of the drum, this neck being preferably circular in cross-section to provide uniform strength. Manholes on the axis of the drum. are provided in the usual manner and in order' to obtain uniform strength in the walls of the neck, such manholes are preferably circulan, This, initurn, involves the use of circular manhole covers, and since manhole covers for high pressure should close the manhole from within the drum, this involves the use of a circular manhole cover which is larger than the circular anhole itself. Consequently the manhole c ver cannot be inserted into the drum from the exterior of the finished drum. In order to avoid this difficulty and enable the use of circular manhole covers in seamless drums, I provide a method by which the finished manhole cover is placed inside of and preferably attached to the wall of the cylindrical shell from which the drum is to be formed. The attachment is formed in such away that the cover can be detached from the cylinder wall after the drum is formed \Vhere the drum is to be used for steam boilers and, therefore, has water tubes inserted therein, I provide the fastening in such a way that any openings through the wall of the cylinder necessitated by such fasteners, will come at a place where a still larger opening must be made for such water tubes.

In the illustrative embodiment, a manhole cover 7 is placed inside of the shell 6 before the ends are closed in and attached to the walls of the cylinder by bolts 8 extending through suitable holes in the walls, these holes being positioned at points where water tubes 12 are later to be inserted in the walls of the drum. The bolts 8 are threaded into 9, 1926. Serial No. 134,513.

the covers 7 and are also threaded at their outer ends and provided with nuts 9, so that when the nuts 9 are removed, the bolts 8 will drop out of their holes in the wall of the drum to free the cover.

In practice, the manhole opening in the neck 13 of the drum is provided with a cir-- cular ledge 16. against which the manhole cover 7 is drawn inthe usual manner by the nuts 17 on the standing bolts 18, those bolts extending through the usual cross pieces 19 engaging with the end of the drum. It will be understood, of course, that the pressure of the fluid inside of the drum will hold the cover tightly against the ledge 16 to seal the opening in the usual manner.

The cover 7 may be provided with a hinge support which, in the form illustrated, is made up of the parts 20, 21 attached at one end to a bracket 22 fastened to the inner side of the cover 7 and the other end attached to a bracket 23 bolted to the inner surface of the drum. It will be understood that this hinge construction can be applied to the drum after it is made, the workman having access to the interior of the drum through the manholes.

It will be obvious that the arrangement which I have shown is merely illustrative and that the embodiment of my invention may be widely varied.

I claim:

1. The method of manufacturing a boiler drum which comprises inserting within the drum a manhole cover and shaping the material of the end of the drum to form a manhole through which the cover is unable to pass but which it is adapted to close.

2. The method of manufacturing a boiler drum which comprises inserting within the drum a cover and shaping the material of a portion of the drum to form an opening through which the cover' is unable to pass but which it is adapted to close.

3. The method of manufacturing a boiler drum which comprises inserting within the drum a cover and forming a portion of the drum with an opening through which the cover is unable to pass but which it isadapted to close, and mounting the cover within the drum to move into and out of position to close the opening.

4. The method of manufacturing a boiler drum which comprises forming holes therein, suspending a cover within the drum by means assing through one or more of said holes, orming a portion of the drum with an opening throu h which the cover is unable to pass but w ich it is adapted to close, removing the suspending means, and securing tubes in position, said tubes being located at said holes.

5. The method of manufacturing a boiler drum which comprises inserting within the drum a circular cover and shaping the material of a portion of the drum to form a circular opening of smaller diameter than the cover and with a seat surrounding the opening and adapted to receive the cover.

6. The method of manufacturing a boiler drum which comprises inserting a cover through an opening in. the drum, and shaping the material of the drum to reduce the size of the opening and to form an interior seat for the cover.

7. The method of manufacturing a boiler drum which comprises inserting a cover through an opening in the drum, reducing the size of the opening to form an interior seat for the cover, and mounting the cover within the drum to move to and from said seat.

8. The method of manufacturing a boiler drum from a cylindrical shell which comprises inserting a cover within the shell through the open end thereof, and shaping the material of the drum to reduce the size of said open end to form an opening through which the cover is unable to pass but which it is adapted to close. 9. The method of manufacturing a boiler drum from a shell with an open end which comprises inserting a cover through said open end, and shaping the material of the drum to reduce the size of the opening at said end and to form'an interior seat for said cover, by which seat the cover cannot pass through said opening:

10. In combination, a boiler drum having a neck sha ed from the material of the drum, said neck having a seat therein, and a cover disposed within said drum and adapted to contact with said seat to close the neck but incapable of passing the seat.

11. In combination, a boiler drum having a neck shaped from the material of the drum, said neck having a seat therein, a cover disposed within said drum and adapted to contact with said seat to close the neck but incapable of passing the seat, and means securing the cover to the interior of the drum in position tobe moved into and out of contact with the seat.

ISAAC HARTER. 

